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Air hole, burnthrough, cooapse and welding crackle occurred in the fixed overhead weld for aluminium and aluminium alloy tubes, above all the small-size thin wall tube.

针对合金管,特别是小口径薄壁管固定口仰焊部位易出现气孔、穿、塌陷焊接热裂纹等问题,分析问题存在原因,从焊接面入手,提出一套消除气孔穿操作手法。

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Its hide is comparable to that of an elephant's, making it able to shrug off most small caliber weapons fire with little effect.

皮相媲美, 这使它能够对多数小口径武器火力不屑一顾,收效甚微。

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经济学人 Science and technology

Some ships do sail with armed guards, but their small-calibre weapons would be hard put to stop a reinforced drone boat whipping across the waves, according to Mr Crino.

克里诺表示,有些船只确实配备了武装警卫,小口径武器很难阻止一艘加强型无人驾驶船在海浪中疾驰。

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